Postal Rate: Agree or Disagree?
View card with 1c franking, 1901 to New York. For the period the postal card rate to the U.S. at 1c. IS THE FRANKING PROPER?

Technically the card should have been charged at 2c First Class Mail matter rate because it does not bear the imprint “Private Mailing Card - Authorized by Act of Congress, May 19, 1898.” This Act authorized and encouraged private printers to make and sell the cards by lowering the required mail rate from 2 cents to 1 cent. 

The wording “Private Mailing Card” was to distinguish view cards from the government printed postal cards. Only the address was allowed to be written on the stamp side and a space around the image was purposely placed for any message from the sender. 

1900 View card to Shanghai, subjected to 15 Centimes Postage Due resulting in 5c First Class Mail matter rate and not the 2c rate for postal cards. WHY?

The card does not bear the imprint “Postal Card - Carte Postale”  or "Tarjeta Postal" in order for it to be allowed to pass through the international mail system at 2c postal card rate. Thus, the 3c Dues (without penalty) is proper.